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water level warning light/ LED

Often when a typhoon or rainstorm rainy season will lead to lower automobile tunnel water, the water will still be there even know persevere with passers will easily lead to drowning in the tunnel steam locomotive so we think if you put an LED on the outside of the tunnel measurements water machine can now inform passersby with water to the inside of the tunnel is the product of a few liters , with passers-by finally let go on their own assessment of whether or not we want to design the appearance of the product , as this looks like a thermometer impressed